Abstract
A sustainable and practical process is presented for the direct synthesis of sodium tanshinone ⅡA sul-fonate(STS).Our approach was inspired by the well-established and industrially applied batch synthetic route for STS production.We constructed a telescoped two-step continuous flow platform.This involved a continuous tanshinone ⅡA sulfonation and in-line salt formation.For the setup,we constructed a 3D circular cyclone-type microreactor using femtosecond laser micromachining.Compared to the 68％yield for 2 h in batch,the two-step continuous flow had an STS yield of 90％,achieved for a total residence time of＜3.0 min under optimal conditions.The proposed continuous flow method vastly simplified the operation and improved procedural safety,while significantly reducing the required acid content and wastewater production.
NETL
NSTL
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